Improved heads for double-seaming



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Mig* MW Unire Samaras Aarem i muon.

SAMUEL H. DEENN ON, OE NEW YORK, N. Y., ASSIGNOR TO LEW'IS A.

OARMER, OE SAME PLACE.

Specilication forming part of Letters Patent No. 33,4163, dated October 8, 1861.

To all whom, it may concern,.-

Be it known that I, SAMUEL H. DRnNNoN, of the State, county, and city of New York, have invented a new and Improved Mode of Constructing and Using Heads for Double- Seaming,77 so called, employed by tin and copper smiths and others; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters and figures thereof.

Of said drawings, Figure l is a perspective view of my improvement. Fig. 2 is a top View. Fig. 3 is a side elevation. Fig. 4 is an end elevation showing the different configurations of the face of the head, which vary according to the size and shape or degree of curvature ofthe work to be double-seamed. These different congurations are technically termed sweeps, and in practice may, of course, be of any desired number. The figures illustrate those most generally employed. Fig. 5 represents a workbench with the ordinary stake as at present used Without the addition of my improvement. Fig. 6 is a similar bench and stake, but having my improved head apf plied to the same. In this iigure the stake is shown as broken, but if represented at its full length it would be as long as the stake shown in Fig. 5.

rI he nature of my invention consists, mainly, in so constructing the head used for double seaming as that it may be separate from the stake or teest7 upon which it is to be secured for use, (but which when my invention is employed is merely required to support the head,) and may be capable of being fastened to or removed from the stake at pleasure, so that after the stakebody is once made to iit with the head as many ot' the latter as are desi red, with such different sweeps as are needed, may be employed with it, thus affording to the workman as many various configurations of the face of the head as he may require, while but one stake-body is necessary. The stakebody, moreover, does not require to be 1inished up at all, and,as will be hereinafter seen, a great economy and advantage results from the use of my invention, which could not be attained by any other mode, at least so far as is known to me.

To enable others skilled in the art to make and use my said invention, I will proceed to describe its construction and mode of operation. i

It is well known that that process in the arts which is termed double-scanning consists in so forming up the edges or" pieces of sheet metal which it is desired to join together that when these edges are placed in contact and pressure applied to them by means of a hammer or other instrument they will interlock with each other, and remain permanently fast together without the use of solder, rivets, or other analogous method of securing. Afamiliar illustration of this process of joining is seen in an ordinary stove-pipe, the edges of which are put together by double-seaming them. It is also well known that in order to rst form the edges to be joined into the double seams a machine called a double-seaming machine7 is employed, and that after the seams are in this or any other manner formed lon the sheet metal they arc then closed up into the finished joint. My improvement relates only to the latter part of this process-that by which the seams are finally securely pressed or hammered together. The mode of doing this at present in use', so far as my knowledge extends, consists in making use of a heavy stake or teest of cast-iron or other suitable material, which is shaped something like the letter T, and is shown in the drawings at Fig. 5. The short arm of this stake or mandrel is then in` serted through a hole made to receive it near the front edge of the workmans bench, by which means it is held steady in its place, and the longer arm (represented by ain the drawings) projects over the edge of the bench and receives upon its upper surface the work to be seamed together. This long arm is required to be nished smooth upon its upper side, so as not to injure the metal placed upon it, and also requires to have given to it in casting the desired conguration or sweep to adapt it to the particular form of the work to be seamed; but one of these stakes or mandrels will only answer for work of the particular interior form to which the upper surface of the stake is nished, and,consequently,when,as is constantly occurring in practice, work of varying shapes or sizes is to be put together as many of these stakes, finished as described, must be provided as there are essential variations in the forms or dimensions of the work.

I have effected a substitute for the process above described by employing only one of the set of mandrels above described (which may be that one having the least curvature) and discarding the rest, and instead of them simply forming what I call a head separate from the stake or mandrel, and made to t onto the mandrel, as shown in Fig. 6, and upon this head, so fastened upon the mandrel, the fixing together of the joint is performed. The head is made of cast-iron or other suitable material, the top or face7 of it being finished smooth, and having given to it whatever sweep is desired, and is then slipped over and fastened to the stake-body by means of the set-screw B shown in the drawings. The work is then put together at the seams upon this adjustablel head, instead of upon the mandrel or stake, as in the ordinary process.

To suit the different shapes and sizes of the work to be put together I construct whatever movable heads may be needed, giving to their respective upper surfaces the suitable sweep to the stake-body at pleasure, and all the various forms of work can be put together upon them in the same manner as upon the present form of mandrel, but with greater economy of the cost of the tools, and with especial conven? ience to the workman, since as one and the same stake-body is used for whatever number of different shaped heads may be required no time or trouble in lifting out and changing the stake is necessary.- a

Having thus described my said invention, what I claim therein, and desire to secure by Letters Patent, is

The combination of a separate adjustable head substantially as described with a mandrel or stake for double-seaming or other purpose.

S. H. DRENN'ON.- lVitnesses:

CHAs. SPIEGLE, ANDREW I. TODD. 

